DE REWAL CHEMICAL CO.
KINGWOOD TOWNSHIP, NJ
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The DeRewal Chemical Company site is located in Kingwood Township, New Jersey. From 1970 to 1973, the DeRewal Chemical Company used the site for the storage of chemicals. Chemicals handled included a range of metals, acid solutions and fertilizer nutrients and associated compounds. Numerous chemical spills were reported in 1973, including one incident in which the contents of a tank truck containing an acidic chromium solution were allowed to drain onto the soil. The DeRewal Chemical Company ceased operations at the site around 1974. The U.S. Environmental Protection Agency's (EPA's) soil cleanup has been completedand a groundwater cleanup was also performed. The New Jersey Department of Environmental Protection (NJDEP) has initiated a groundwater monitoring program at the site.
What Has Been Done to Clean Up the Site?
The treatment system for the on-site residential well was installed in 1991. After a number of years, the residence became vacant and the well was properly abandoned. A cultural resources mitigation action in November and December 1996 resulted in the recovery of more than 3,000 Native American artifacts, many dating back more than 1,000 years. EPA worked cooperatively with Kingwood Township and transferred all of the artifacts to the locality.
Soil cleanup started in July 1997 and finished in July 1998. About 60,000 tons of contaminated soil were dug up and disposed of off site. Restoration activities have also been completed. The State obtained a conservation easement dated January 31, 2002, which incorporated portions of the site into the Delaware River Greenway. In addition, the State purchased a portion of the site in November 2002. Construction of the system to address contaminated shallow groundwater started in July 2003 and finished in September 2003.
EPA has conducted three five-year reviews at the site. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review, in 2012, concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment.
What Is the Current Site Status?
The site is being addressed in two remedial phases focused on cleanup of contaminated soils and shallow groundwater.
Entire Site: Based on studies of the contamination at the site, EPA selected a remedy that included: (1) excavation of contaminated soil; (2) on-site thermal treatment of organic-contaminated soil; (3) on-site solidification and stabilization of the thermally treated soil and the inorganic-contaminated soil; (4) extraction of shallow contaminated groundwater with off-site disposal at an approved industrial wastewater treatment facility; (5) provision of a treatment system for the on-site residential well; and (6) monitoring to ensure the effectiveness of the remedy.
After reviewing additional data gathered during the design process, and presenting its findings to the public, EPA changed the remedy for the organic-contaminated soil from on-site to off-site thermal treatment in December 1994. EPA changed the remedy for the inorganic-contaminated soil to off-site treatment and disposal in June 1997. Chromium-contaminated soil located below the water table would also not be excavated since it was not a source of groundwater contamination.
Operation of the groundwater remediation system has been suspended. NJDEP has initiated a groundwater monitoring program at the site.